Canon iR3245, Service Manual

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Chapter 4
4-6
4.3 Start-Up Sequence
4.3.1 Overview
0019-3115
iR3225 / iR3225N / iR3235 / iR3235N / iR3245 / iR3245N
The system software that controls the equipment is installed on HDD.
There are two types of system software; system software 1 for CPU1 (IC51), system software 2 for CPU2 (IC45).
When the host machine is started, the CPU1 loads the BIOS program in BIOS to the SDRAM for system processing, and then loads the system software 1 and the
system software 2 from HDD to the SDRAM for system processing. After that, the CPU 1 executes the system software 1.
The CPU2 requests the system software 2 to the CPU1 according to the BOOT program in the BOOTROM.
The system software 2 is transferred from the SDRAM for system processing to the SDRAM for image processing, and then executed.
F-4-5
T-4-5
While the CPU1 or the CPU2 is reading system software from HDD to SDRAM and executing start-up sequence including hardware initialization, the following
screen is displayed, where the progress bar indicates the progress status.
F-4-6
MEMO:
The boot program (included in system program 1) of the CPU1 (IC51) is stored in HDD.
HDD is accessed while the progress bar is being displayed. Never turn off the main power.
If the main power is turned off, a fault in HDD (E602) may occur.
SDRAM for system processing
CPU1 / (IC51)
HDD
System
area
Image area
BIOS
program
BIOS
SDRAM for image processing
CPU2 / (IC45)
System
area
Image area
BOOTROM
BOOT
program
: Flow of program at execution
: Flow of system program
System
software 1
System
software 2
System
software 1
System
software 2
Included in SYSTEM (system software).
Upgrade the version of SYSTEM in upgrading.